针对Sentinel-2卫星影像拥有3个对植被生长状况非常敏感、空间分辨率为20 m的红边波段(705、740、783 nm),其空间分辨率与可见光和近红外波段10 m的空间分辨率不一致,使Sentinel-2影像应用受到限制的问题,基于多光谱多分辨率估计的超分...针对Sentinel-2卫星影像拥有3个对植被生长状况非常敏感、空间分辨率为20 m的红边波段(705、740、783 nm),其空间分辨率与可见光和近红外波段10 m的空间分辨率不一致,使Sentinel-2影像应用受到限制的问题,基于多光谱多分辨率估计的超分辨率(Super-resolution for multispectral multiresoltion estimation,Sup Re Me)算法将空间分辨率20 m的6个波段重建为10 m;以重建后的影像为数据源,耦合PROSAIL辐射传输模型和随机森林模型反演玉米冠层叶面积指数(LAI),并以野外实测LAI验证其反演精度。结果表明,采用Sup Re Me算法对Sentinel-2影像进行重建后,在保持光谱特性不变的同时提高了影像的空间细节;基于重建影像和原始影像的LAI反演决定系数R2分别为0.70、0.68,均方根误差RSME分别为0.240、0.262。研究表明,利用Sup Re Me算法重建后的Sentinel-2卫星影像,能够在提高玉米冠层LAI反演空间分辨率的同时提高反演精度,在挖掘高分辨率农作物生长信息方面具有很大潜力。展开更多
The drastic difference in healing capacity between the anterior cruciate ligament and medial collateral ligament injuries is still largely unexplained.So,studying the molecular expression after anterior cruciate ligam...The drastic difference in healing capacity between the anterior cruciate ligament and medial collateral ligament injuries is still largely unexplained.So,studying the molecular expression after anterior cruciate ligament and medial collateral ligament injury could be a new direction to explain such differences.In this study,eighteen male 3-month-old New Zealand white rabbits were randomly divided into six groups by injury modeling to study the molecular expression after anterior cruciate ligament and medial collateral ligament injury.The expression of molecular genes and proteins was examined using reverse transcriptase chain reaction and Western blotting.Marked differences were found in the postinjury changes in gene levels and proteins in the anterior cruciate ligament compared to the medial collateral ligament.The results show that there were drastic differences in angiogenesis,collagen and matrix metalloproteinases after anterior cruciate ligament and medial collateral ligament injury.It can be found that the repair ability of the anterior cruciate ligament and medial collateral ligament after injury may be related to the differences in molecular expression.展开更多
文摘针对Sentinel-2卫星影像拥有3个对植被生长状况非常敏感、空间分辨率为20 m的红边波段(705、740、783 nm),其空间分辨率与可见光和近红外波段10 m的空间分辨率不一致,使Sentinel-2影像应用受到限制的问题,基于多光谱多分辨率估计的超分辨率(Super-resolution for multispectral multiresoltion estimation,Sup Re Me)算法将空间分辨率20 m的6个波段重建为10 m;以重建后的影像为数据源,耦合PROSAIL辐射传输模型和随机森林模型反演玉米冠层叶面积指数(LAI),并以野外实测LAI验证其反演精度。结果表明,采用Sup Re Me算法对Sentinel-2影像进行重建后,在保持光谱特性不变的同时提高了影像的空间细节;基于重建影像和原始影像的LAI反演决定系数R2分别为0.70、0.68,均方根误差RSME分别为0.240、0.262。研究表明,利用Sup Re Me算法重建后的Sentinel-2卫星影像,能够在提高玉米冠层LAI反演空间分辨率的同时提高反演精度,在挖掘高分辨率农作物生长信息方面具有很大潜力。
文摘The drastic difference in healing capacity between the anterior cruciate ligament and medial collateral ligament injuries is still largely unexplained.So,studying the molecular expression after anterior cruciate ligament and medial collateral ligament injury could be a new direction to explain such differences.In this study,eighteen male 3-month-old New Zealand white rabbits were randomly divided into six groups by injury modeling to study the molecular expression after anterior cruciate ligament and medial collateral ligament injury.The expression of molecular genes and proteins was examined using reverse transcriptase chain reaction and Western blotting.Marked differences were found in the postinjury changes in gene levels and proteins in the anterior cruciate ligament compared to the medial collateral ligament.The results show that there were drastic differences in angiogenesis,collagen and matrix metalloproteinases after anterior cruciate ligament and medial collateral ligament injury.It can be found that the repair ability of the anterior cruciate ligament and medial collateral ligament after injury may be related to the differences in molecular expression.